[ubuntu] Bridge KVM guests to LAN & VPN only (no direct internet)

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Hi
I'm *relatively* new to Ubuntu. I used Linux some time ago, but haven't used it much for a while, and was really using it more for basic tasks + a bit of coding rather than complex set-ups. I'm posting this here (having toyed with the idea of posting it in the Absolute Beginners section because this is only my second post or so, and in the Virtualization section because it involves KVM network bridges), but decided that ultimately it was a pretty specific question that belongs in the networking forum. I hope that's ok.
I have in the last few months been getting back into linux (speci
(Hardware)

I am intentionally double posting this in the Absolute Beginner Talk forum and the hardware forum as I think it is so important to both beginners looking for help here and those beginners (and even more experienced users) in the Hardware forum to read this.